使用Jasmine监视Javascript构造函数

Question

我正在编写一些Javascript类的规范(backbone.js视图,用Coffeescript编写),我想确保一个视图构建另一个视图.

我试图通过监视构造函数来做到这一点,如下所示:

describe 'Avia.AviaView', ->

  beforeEach ->
    @aviaView = new Avia.AviaView()
    @matricesView = new Backbone.View()
    spyOn(Avia.MatricesView, 'constructor').andReturn @matricesView

  describe 'initialize', ->

    beforeEach ->
      @aviaView.initialize()

    it 'creates a new MatricesView ', ->
      expect(Avia.MatricesView.constructor).toHaveBeenCalledOnce()

initialize()对AviaView 的调用肯定会导致调用MatricesView构造函数,礼貌这一行:

new Avia.MatricesView($("#tabs-3")).initialize()

它确实有效; 如果我手动运行应用程序,我可以看到正在调用的构造函数initialize().但是我的Jasmine规范失败了:

Running Jasmine specs...
F

Avia.AviaView initialize creates a new MatricesView . (/Users/dev/avia/spec/javascripts/views/avia_view_spec.js.coffee:13)
  Expected constructor to be called exactly once, but was called '0' times (line ~14)
    expect(Avia.MatricesView.constructor).toHaveBeenCalledOnce();

FAIL: 1 test, 1 failure, 0.008 secs.

我和几位同事交谈了,他们同意这应该有用......有人能建议一种监视施工人员的好方法吗？

Answer 1

怎么样:

describe 'Avia.AviaView', ->

  beforeEach ->
    @aviaView = new Avia.AviaView()
    @matricesView = new Backbone.View()
    spyOn(Avia, 'MatricesView').andReturn @matricesView

  describe 'initialize', ->

    beforeEach ->
      @aviaView.initialize()

    it 'creates a new MatricesView ', ->
      expect(Avia.MatricesView).toHaveBeenCalledOnce()